> I wonder how would [...] my PA Semi [...] pass the same test
> [...]
> - Slower RAM and mem controller then V4

PA6T on X1000 has actual memory performance of 2.7...4.0 GB/s (depending on chunk size and access type) according to RAGEMEM benchmark. What's the actual memory performance on Vampire V4? You quoted ≈0.5...≈0.7 GB/s for Vampire V2 in comment #13, so less than a fifth of PA6T performance. Is Vampire V4 really that faster?
(Btw, your quoted ≈0.3 GB/s for PA6T is measured with an m68k program, so that's the memory performance of the m68k emulation running on PA6T, not that of the PA6T itself.)